1895,] LORIUS PLATOPALLIATUS AND PSITTACUS EEITHACCS. 315 



surface of the (jj) parapophysis, or parapophysial lamella, more 

 sharply developed than in the axis ; the nem-al spine is more 

 dorsad, the apices of the hyperapophyses (hji) even somewhat 

 preaxiad. The hinder margin of the plem-apophysial lamella (pi) 

 shows an inclination to develop two superimposed, postaxiad 

 prominences. 



Fig. 4. 



D .. /'''^ 



n ^*^i 



pi 



Axis of Psittacus erithactis. 



A. Anterior aspect. B. Dorsal aspect. C. Lateral aspect. 

 D. Ventral aspect. 



h. Hypapophysis. 

 hp. Hyperapophysis. 

 n. Neural spine. 



o. Odontoid process. 

 pi. Pleurapophysial lamella. 

 ptz. Postzygapophysis. 



Fig. 5. 





F'^ 



P'- h 



si c 



¥--. 



'M 





&> 



ji 



k 'k f' 



Lateral aspect of 3rd to 12th vertebrae of Lorius flavopalliatus. 



c. Catapophysis. 



d. Diapophysis. 

 /. Foramen. 



h. Hypapophysis. 

 hp. Hyperapophysis. 

 iz. Interzygapophysial ridge. 



m. Metapophysis. 



n. Neural spine. 



pi. Pleurapophysial lamella. 

 pt£. Postzygapophysis. 

 pz. Prezygapophysis. 



st. Styliform process. 



y:f^ 



The fourth vertebra has, in both species, the prezygapophyses 

 (pz) extending much preaxiad. In L. flavopalliatus the netu-al 



